Senior Full-Stack SaaS Engineer – APIs, Data & Marketing Attribution

We are building a multi-tenant marketing intelligence platform that connects SEO data, website analytics, call tracking systems, lead forms and multiple third-party CRMs to attribute marketing activity through to admissions and revenue. Required experience: Multi-tenant SaaS applications * React / Next.js or similar frontend * Node.js, Python, or similar backend * PostgreSQL/database architecture * REST APIs * Webhooks * OAuth/API authentication * ETL/data pipelines * CallRail / CallTrackingMetrics integrations * GA4 + Google Search Console APIs * CRM integrations like HubSpot/Salesforce/custom CRMs * Identity resolution / attribution * Analytics dashboards * AWS/Vercel/Azure infrastructure * HIPAA/security architecture